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Edge-Hydrogenated Germanene by Electrochemical Decalcification-Exfoliation of CaGe2: Germanene-Enabled Vapor Sensor
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-24 , DOI: 10.1021/acsnano.1c06675 Evgeniya Kovalska 1 , Nikolas Antonatos 1 , Jan Luxa 1 , Zdenek Sofer 1
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-24 , DOI: 10.1021/acsnano.1c06675 Evgeniya Kovalska 1 , Nikolas Antonatos 1 , Jan Luxa 1 , Zdenek Sofer 1
Affiliation
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Two-dimensional germanene has been recently explored for applications in sensing, catalysis, and energy storage. The potential of this van der Waals material lies in its optoelectronic and chemical properties. However, pure free-standing germanene cannot be found in nature, and the synthesis methods are hindering the potentially fascinating properties of germanene. Herein, we report a single-step synthesis of few-layer germanene by electrochemical exfoliation in a nonaqueous environment. As a result of simultaneous decalcification and intercalation of the electrolyte’s active ions, we achieved low-level hydrogenation of germanene that occurs at the edges of the material. The obtained edge-hydrogenated germanene flakes have a lateral size of several micrometers and possess a cubic structure. We have pioneered the potential application of edge-hydrogenated germanene for vapor sensing and demonstrated its specific sensitivity to methanol and ethanol. Furthermore, we have shown a selective behavior of the germanene-based sensor that appears to increase the electrical resistance in the vapors where methanol prevails. We anticipate that these results can provide an approach for emerging layered materials with the potential utility in advanced gas sensing.
中文翻译：
通过 CaGe2 的电化学脱钙剥离进行边缘氢化锗烯：启用锗烯的蒸汽传感器
最近探索了二维锗烯在传感、催化和能量存储方面的应用。这种范德华材料的潜力在于其光电和化学特性。然而，在自然界中找不到纯独立的锗烯，合成方法阻碍了锗烯潜在的迷人特性。在此，我们报告了在非水环境中通过电化学剥离一步合成少层锗烯。由于电解质的活性离子同时脱钙和嵌入，我们实现了在材料边缘发生的锗烯的低水平氢化。得到的边缘氢化锗烯薄片具有几微米的横向尺寸并具有立方结构。我们开创了边缘氢化锗烯在蒸汽传感方面的潜在应用，并证明了其对甲醇和乙醇的特殊敏感性。此外，我们还展示了基于锗烯的传感器的选择性行为，该行为似乎增加了甲醇盛行的蒸汽中的电阻。我们预计这些结果可以为新兴的层状材料提供一种方法，在先进的气体传感中具有潜在的实用性。
更新日期：2021-10-26
中文翻译：
通过 CaGe2 的电化学脱钙剥离进行边缘氢化锗烯：启用锗烯的蒸汽传感器
最近探索了二维锗烯在传感、催化和能量存储方面的应用。这种范德华材料的潜力在于其光电和化学特性。然而，在自然界中找不到纯独立的锗烯，合成方法阻碍了锗烯潜在的迷人特性。在此，我们报告了在非水环境中通过电化学剥离一步合成少层锗烯。由于电解质的活性离子同时脱钙和嵌入，我们实现了在材料边缘发生的锗烯的低水平氢化。得到的边缘氢化锗烯薄片具有几微米的横向尺寸并具有立方结构。我们开创了边缘氢化锗烯在蒸汽传感方面的潜在应用，并证明了其对甲醇和乙醇的特殊敏感性。此外，我们还展示了基于锗烯的传感器的选择性行为，该行为似乎增加了甲醇盛行的蒸汽中的电阻。我们预计这些结果可以为新兴的层状材料提供一种方法，在先进的气体传感中具有潜在的实用性。
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